Joshua, Probably not. The ultimate BW of your receiver is set by the
DSP and noise power is "sort of" proportional to BW. The purpose of the
roofing filters is to protect the ADC sampler at the head end of the DSP
from very strong signals that could drive it to saturation.
Noise, other than atmospheric and galactic, needs to be attacked at the
source. Like getting rid of your switching wall warts and power
supplies. So long as the atmospheric noise is not saturating the ADC,
reducing the DSP BW is the only really effective way to reduce it's
impact, and that's a lot easier on CW than on SSB. Different roofing
filters are not likely to make much difference at all unless they're
more narrow than your DSP setting.
On 3/24/2015 7:24 PM, Joshua Gould wrote:
All,
Would the roofing filters help reduce atmospheric noise? I'm having a heck
of a time hearing anything over the S5 noise levels that I seem to be
dealing with of late. But at least it's better than the S9 noise I was
getting from switching power supplies under my desk...
72,
Joshua Gould
K8WXA
EM89pn
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